Japan's Emperor Naruhito with Empress Masako, second right, their daughter Princess Aiko, right, Crown Prince Akishino, third left, Crown Princess Kiko, second left, and their daughter Princess Kako, left, as they appear on the balcony of the Imperial Palace to mark the emperor's 63th birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

TOKYO, JAPAN - FEBRUARY 23: (From R) Japanese Crown Prince Fumihito, Crown Princess Kiko and Princess Kako greet the public on Emperor Naruhito's birthday on February 23, 2023 in Tokyo, Japan. Takashi Aoyama/Pool via REUTERS 

Japan's Emperor Naruhito delivers a speech as Empress Masako, second right, their daughter Princess Aiko, right, Crown Prince Akishino, third left, Crown Princess Kiko, second left, and their daughter Princess Kako, left, appear on the balcony of the Imperial Palace to mark the emperor's 63th birthday in Tokyo Thursday, Feb. 23, 2023, in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's imperial family members: Former Empress Michiko, former Emperor Akihito, Emperor Naruhito, Empress Masako, Princess Aiko, Crown Prince Akishino, Crown Princess Kiko and Princess Kako waves to well-wishers for the New Year's greetings at the Imperial Palace in Tokyo on January 2, 2023, the first time in three years. YOSHIKAZU TSUNO/Pool via REUTERS 

Japan's imperial family members, former Empress Michiko, former Emperor Akihito, Emperor Naruhito, Empress Masako, Princess Aiko, Crown Prince Akishino and Crown Princess Kiko waves to well-wishers for the New Year's greetings at the Imperial Palace in Tokyo on January 2, 2023, the first time in three years. YOSHIKAZU TSUNO/Pool via REUTERS 

TOKYO, JAPAN - JANUARY 02: Emperor Emeritus Akihito, Empress Emerita Michiko, Emperor Naruhito, Empress Masako, Crown Prince Fumihito of Akishino and Crown Princess Kiko of Akishino attend the New Year's appearance by the Japanese royal family at the Imperial Palace on January 2, 2023 in Tokyo, Japan. The event was held for the first time in three years, following a hiatus due to the coronavirus pandemic. Tomohiro Ohsumi/Pool via REUTERS 

TOKYO, JAPAN - JANUARY 02: Emperor Emeritus Akihito, Empress Emerita Michiko, Emperor Naruhito, Empress Masako, Princess Aiko, Crown Prince Fumihito of Akishino, Crown Princess Kiko of Akishino and Princess Kako of Akishino wave during the New Year's appearance by the Japanese royal family at the Imperial Palace on January 2, 2023 in Tokyo, Japan. The event was held for the first time in three years, following a hiatus due to the coronavirus pandemic. Tomohiro Ohsumi/Pool via REUTERS 

TOKYO, JAPAN - JANUARY 02: Princess Akiko of Mikasa, Princess Nobuko of Mikasa, Emperor Emeritus Akihito, Empress Emerita Michiko, Emperor Naruhito, Empress Masako, Princess Aiko, Crown Prince Fumihito of Akishino, Crown Princess Kiko of Akishino, Princess Kako of Akishino, Princess Hisako of Takamado and Princess Tsuguko of Takamado wave during the New Year's appearance by the Japanese royal family at the Imperial Palace on January 2, 2023 in Tokyo, Japan. The event was held for the first time in three years, following a hiatus due to the coronavirus pandemic. Tomohiro Ohsumi/Pool via REUTERS 

TOKYO, JAPAN - JANUARY 02: Emperor Emeritus Akihito, Empress Emerita Michiko, Emperor Naruhito, Empress Masako, Princess Aiko, Crown Prince Fumihito of Akishino, Crown Princess Kiko of Akishino and Princess Kako of Akishino attend the New Year's appearance by the Japanese royal family at the Imperial Palace on January 2, 2023 in Tokyo, Japan. The event was held for the first time in three years, following a hiatus due to the coronavirus pandemic. Tomohiro Ohsumi/Pool via REUTERS 

TOKYO, JAPAN - JANUARY 02: Crown Prince Fumihito of Akishino, Crown Princess Kiko of Akishino, Princess Kako of Akishino, Princess Yuriko of Mikasa, Princess Nobuko of Mikasa and Princess Akiko of Mikasa wave during the New Year's appearance by the Japanese royal family at the Imperial Palace on January 2, 2023 in Tokyo, Japan. The event was held for the first time in three years, following a hiatus due to the coronavirus pandemic. Tomohiro Ohsumi/Pool via REUTERS 

Former Japanese emperor Akihito, former empress Michiko, Japan's Emperor Naruhito, Empress Masako, their daughter Princess Aiko, Crown Prince Akishino, Crown Princess Kiko and their daughter Princess Kako appear before well-wishers during the traditional New Year's greeting ceremony by Japan's royal family at the Imperial Palace in Tokyo on January 2, 2023. PHILIP FONG/Pool via REUTERS 

Japanese Princess Aiko, daughter of Emperor Naruhito chats with Crown Prince Akishino and Crown Princess Kiko as they attend the New Year's greetings at the Imperial Palace in Tokyo on January 2, 2023, the first time in three years. YOSHIKAZU TSUNO/Pool via REUTERS 

Japanese Crown Prince Akishino accompanied by Crown Princess Kiko and his daughter Princess Kako waves to well-wishers for the New Year's greetings at the Imperial Palace in Tokyo on January 2, 2023, the first time in three years. YOSHIKAZU TSUNO/Pool via REUTERS 

Japanese Crown Prince Akishino accompanied by Crown Princess Kiko and his daughter Princess Kako, wave to well-wishers for the New Year's greetings at the Imperial Palace in Tokyo on January 2, 2023, the first time in three years. YOSHIKAZU TSUNO/Pool via REUTERS REFILE- CORRECTING ID 

TOKYO, JAPAN - JANUARY 02: (L-R) Princess Tsuguko of Takamado, Princess Hisako of Takamado, Princess Hanako of Hitachi, Prince Hitachi, Emperor Emeritus Akihito, Empress Emerita Michiko, Emperor Naruhito, Empress Masako, Princess Aiko, Crown Prince Fumihito of Akishino, Crown Princess Kiko of Akishino, Princess Kako of Akishino, Princess Yuriko of Mikasa, Princess Nobuko of Mikasa and Princess Akiko of Mikasa during the New Year's appearance by the Japanese royal family at the Imperial Palace on January 2, 2023 in Tokyo, Japan. The event was held for the first time in three years, following a hiatus due to the coronavirus pandemic. Tomohiro Ohsumi/Pool via REUTERS 

Tennis - ATP 500 - Japan Open Tennis Championships - Ariake Coliseum, Tokyo, Japan - October 9, 2022 Japanese Princess Kako, a daughter of Crown Prince Akishino in the royal box before the start of the men's singles final REUTERS/Androniki Christodoulou 

Tennis - ATP 500 - Japan Open Tennis Championships - Ariake Coliseum, Tokyo, Japan - October 9, 2022 Japanese Princess Kako, a daughter of Crown Prince Akishino in the royal box before the start of the men's singles final REUTERS/Androniki Christodoulou 

Japanese Princess Kako, a daughter of Crown Prince Akishino leaves the Budokan hall after she attended the state funeral of slain former Japanese Prime Minister Shinzo Abe who was shot dead during an election campaign in Tokyo on September 27, 2022. Some 4,300 attendees including foreign delegates from over 200 countries attend the funeral ceremony. YOSHIKAZU TSUNO/Pool via REUTERS 

Japan's Crown Prince Akishino and Crown Princess Kiko lay flowers at the altar during the state funeral of assassinated former Prime Minister of Japan Shinzo Abe Tuesday Sept. 27, 2022, at Nippon Budokan in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Crown Prince Akishino and Crown Princess Kiko lay flowers at the altar during the state funeral of assassinated former Prime Minister of Japan Shinzo Abe Tuesday Sept. 27, 2022, at Nippon Budokan in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Crown Prince Akishino and Crown Princess Kiko lay flowers at the altar during the state funeral of assassinated former Prime Minister of Japan Shinzo Abe Tuesday Sept. 27, 2022, at Nippon Budokan in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Crown Prince Akishino and Crown Princess Kiko lay flowers at the altar during the state funeral of assassinated former Prime Minister of Japan Shinzo Abe Tuesday Sept. 27, 2022, at Nippon Budokan in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Crown Prince Akishino and Crown Princess Kiko lay flowers at the altar during the state funeral of assassinated former Prime Minister of Japan Shinzo Abe Tuesday Sept. 27, 2022, at Nippon Budokan in Tokyo. Eugene Hoshiko/Pool via REUTERS 

Japan's Crown Prince Akishino (R) and Crown Princess Kiko walk on stage after paying their respects during the state funeral of former Japanese Prime Minister Shinzo Abe at the Nippon Budokan in Tokyo, Japan, 27 September 2022. Thousands of people are gathered in Tokyo to attend the state funeral for former prime minister Shinzo Abe, including foreign dignitaries and representatives from more than 200 countries and international organizations. FRANCK ROBICHON/Pool via REUTERS 

Japan's Crown Prince Akishino (R) and Crown Princess Kiko walk on stage after paying their respects during the state funeral of former Japanese Prime Minister Shinzo Abe at the Nippon Budokan in Tokyo, Japan, 27 September 2022. Thousands of people are gathered in Tokyo to attend the state funeral for former prime minister Shinzo Abe, including foreign dignitaries and representatives from more than 200 countries and international organizations. FRANCK ROBICHON/Pool via REUTERS 

Japan's Crown Prince Akishino (R) and Crown Princess Kiko walk on stage after paying their respects during the state funeral of former Japanese Prime Minister Shinzo Abe at the Nippon Budokan in Tokyo, Japan, 27 September 2022. Thousands of people are gathered in Tokyo to attend the state funeral for former prime minister Shinzo Abe, including foreign dignitaries and representatives from more than 200 countries and international organizations. FRANCK ROBICHON/Pool via REUTERS 

TOKYO, JAPAN - SEPTEMBER 27: Japan's Crown Prince Akishino and Crown Princess Kiko pay respect during the state funeral for Japan's former prime minister Shinzo Abe on September 27, 2022 at the Budokan in Tokyo, Japan. Several current and former heads of state visited Japan for the state funeral of Abe, who was assassinated in July while campaigning on a street. Takashi Aoyama/Pool via REUTERS 

TOKYO, JAPAN - SEPTEMBER 27: Japan's Crown Prince Akishino and Crown Princess Kiko pay respect during the state funeral for Japan's former prime minister Shinzo Abe on September 27, 2022 at the Budokan in Tokyo, Japan. Several current and former heads of state visited Japan for the state funeral of Abe, who was assassinated in July while campaigning on a street. Takashi Aoyama/Pool via REUTERS 

TOKYO, JAPAN - SEPTEMBER 27: Japan's Crown Prince Akishino and Crown Princess Kiko pay respect during the state funeral for Japan's former prime minister Shinzo Abe on September 27, 2022 at the Budokan in Tokyo, Japan. Several current and former heads of state visited Japan for the state funeral of Abe, who was assassinated in July while campaigning on a street. Takashi Aoyama/Pool via REUTERS 

Japan's Crown Prince Akishino and Crown Princess Kiko pay their respects at the altar at the state funeral for former Japanese prime minister Shinzo Abe at the Nippon Budokan in Tokyo on September 27, 2022. PHILIP FONG/Pool via REUTERS 

Japan's Crown Prince Akishino and Crown Princess Kiko attend the state funeral for slain former Prime Minister Shinzo Abe in Tokyo, Japan September 27, 2022. REUTERS/Leah Millis/Pool 

TOKYO, JAPAN - SEPTEMBER 27: Japanese Princess Kako, a daughter of Crown Prince Akishino, attends the state funeral for Japan's former prime minister Shinzo Abe on September 27, 2022 at the Budokan in Tokyo, Japan. Several current and former heads of state visited Japan for the state funeral of Abe, who was assassinated in July while campaigning on a street. Takashi Aoyama/Pool via REUTERS 

Japan's Crown Prince Akishino and Crown Princess Kiko attend the state funeral for slain former Prime Minister Shinzo Abe in Tokyo, Japan September 27, 2022. REUTERS/Leah Millis/Pool 

Japan's Crown Prince Akishino and Crown Princess Kiko attend the state funeral for slain former Prime Minister Shinzo Abe in Tokyo, Japan September 27, 2022. REUTERS/Leah Millis/Pool 

Crown Prince Akishino and Crown Princess Kiko approach to lay flowers during a state funeral for former Japanese Prime Minister Shinzo Abe at Nippon Budokan Hall in Tokyo, Japan, September 27, 2022. REUTERS/Kim Kyung-Hoon/Pool 

Japan's Princess Kako, a daughter of Crown Prince Akishino arrives at the Budokan hall to attend the state funeral of slain former Japanese Prime Minister Shinzo Abe who was killed during an election campaign in Tokyo on September 27, 2022. Some 4,300 attendees including foreign delegates from over 200 countries attend the funeral ceremony. YOSHIKAZU TSUNO/Pool via REUTERS 

Japan's Crown Prince Akishino (2nd L) and Crown Princess Kiko (3rd L) arrive with other family members to attend the state funeral of former Japanese prime minister Shinzo Abe at the Nippon Budokan in Tokyo on September 27, 2022. PHILIP FONG/Pool via REUTERS 

Japanese Crown Prince Akishino (R) accompanied by Crown Princess Kiko (L) arrives at the Budokan hall to attend the state funeral of slain former Japanese Prime Minister Shinzo Abe who was shot dead during an election campaign in Tokyo on September 27, 2022. Some 4,300 attendees including foreign delegates from over 200 countries attend the funeral ceremony. YOSHIKAZU TSUNO/Pool via REUTERS 

Japanese Crown Prince Akishino (L) accompanied by Crown Princess Kiko (R) arrives at the Budokan hall to attend the state funeral of slain former Japanese Prime Minister Shinzo Abe who was shot dead during an election campaign in Tokyo on September 27, 2022. Some 4,300 attendees including foreign delegates from over 200 countries attend the funeral ceremony. YOSHIKAZU TSUNO/Pool via REUTERS 

Japan's Crown Prince Akishino and Crown Princess Kiko waves to a special flight carrying Emperor Naruhito and Empress Masako, heading for the UK to attend Britain's Queen Elizabeth's funeral, as the plane takes off at Haneda international airport in Tokyo, Japan September 17, 2022. REUTERS/Issei Kato 

Japan's Crown Prince Akishino and Crown Princess Kiko waves to a special flight transporting Emperor Naruhito and Empress Masako, heading for the UK to attend Britain's Queen Elizabeth's funeral, as the plane takes off at Haneda International Airport in Tokyo, Japan September 17, 2022. REUTERS/Issei Kato 

Japan's Emperor Naruhito and Empress Masako, accompanied by Crown Prince Akishino and Crown Princess Kiko, walk toward to a special flight heading for the UK to attend Britain's Queen Elizabeth's funeral, at Haneda international airport in Tokyo, Japan September 17, 2022. REUTERS/Issei Kato 

Japan's Emperor Naruhito and Empress Masako, accompanied by Crown Prince Akishino and Crown Princess Kiko, walk toward to a special flight heading for the UK to attend Britain's Queen Elizabeth's funeral, at Haneda international airport in Tokyo, Japan September 17, 2022. REUTERS/Issei Kato 

Japan's Prince Hisahito and his parents Crown Prince Akishino and Crown Princess Kiko speak with the media before his graduation ceremony at a junior high school affiliated with Ochanomizu University, in Tokyo, Japan March 17, 2022. Eugene Hoshiko/Pool via REUTERS 

Japan's Prince Hisahito and his parents Crown Prince Akishino and Crown Princess Kiko speak with the media before his graduation ceremony at a junior high school affiliated with Ochanomizu University, in Tokyo, Japan March 17, 2022. Eugene Hoshiko/Pool via REUTERS 

Japan's Prince Hisahito and his parents Crown Prince Akishino and Crown Princess Kiko pose for media before his graduation ceremony at a junior high school affiliated with Ochanomizu University, in Tokyo, Japan March 17, 2022. Eugene Hoshiko/Pool via REUTERS 

Japan's Prince Hisahito and his parents Crown Prince Akishino and Crown Princess Kiko pose for media before his graduation ceremony at a junior high school affiliated with Ochanomizu University, in Tokyo, Japan March 17, 2022. Eugene Hoshiko/Pool via REUTERS 

Japan's Prince Hisahito and his parents Crown Prince Akishino and Crown Princess Kiko pose for media before his graduation ceremony at a junior high school affiliated with Ochanomizu University, in Tokyo, Japan March 17, 2022. Eugene Hoshiko/Pool via REUTERS 

Japan's Prince Hisahito and his parents Crown Prince Akishino and Crown Princess Kiko pose for media before his graduation ceremony at a junior high school affiliated with Ochanomizu University, in Tokyo, Japan March 17, 2022. Eugene Hoshiko/Pool via REUTERS 

Japan's Prince Hisahito and his parents Crown Prince Akishino and Crown Princess Kiko pose for media before his graduation ceremony at a junior high school affiliated with Ochanomizu University, in Tokyo, Japan March 17, 2022. Eugene Hoshiko/Pool via REUTERS 

Japan's Prince Hisahito and his parents Crown Prince Akishino and Crown Princess Kiko pose for media before his graduation ceremony at a junior high school affiliated with Ochanomizu University, in Tokyo, Japan March 17, 2022. Eugene Hoshiko/Pool via REUTERS 

Mako Komuro, former Japan's Princess Mako and the eldest daughter of Crown Prince Akishino and Crown Princess Kiko, arrives with her husband Kei from Tokyo to start their new life in the U.S. at JFK International airport in New York, U.S., November 14, 2021.REUTERS/Shannon Stapleton 

Mako Komuro, former Japan's Princess Mako and the eldest daughter of Crown Prince Akishino and Crown Princess Kiko, arrives with her husband Kei from Tokyo to start their new life in the U.S. at JFK International airport in New York, U.S., November 14, 2021.REUTERS/Shannon Stapleton 

Mako Komuro, former Japan's Princess Mako and the eldest daughter of Crown Prince Akishino and Crown Princess Kiko, arrives with her husband Kei from Tokyo to start their new life in the U.S. at JFK International airport in New York, U.S., November 14, 2021.REUTERS/Shannon Stapleton TPX IMAGES OF THE DAY 

Mako Komuro, former Japan's Princess Mako and the eldest daughter of Crown Prince Akishino and Crown Princess Kiko, arrives with her husband Kei from Tokyo to start their new life in the U.S. at JFK International airport in New York, U.S., November 14, 2021.REUTERS/Shannon Stapleton 

Mako Komuro, former Japan's Princess Mako and the eldest daughter of Crown Prince Akishino and Crown Princess Kiko, arrives with her husband Kei from Tokyo to start their new life in the U.S. at JFK International airport in New York, U.S., November 14, 2021.REUTERS/Shannon Stapleton 

Mako Komuro, former Japan's Princess Mako and the eldest daughter of Crown Prince Akishino and Crown Princess Kiko, and her newly married husband Kei board a flight bound for New York to start their new life in the U.S. at Haneda airport in Tokyo, Japan November 14, 2021. REUTERS/Issei Kato 

Mako Komuro, former Japan's Princess Mako and the eldest daughter of Crown Prince Akishino and Crown Princess Kiko, and her newly married husband Kei board a flight bound for New York to start their new life in the U.S. at Haneda airport in Tokyo, Japan November 14, 2021. REUTERS/Issei Kato 

People wave as the ANA flight carrying Mako Komuro, former Japan's Princess Mako and the eldest daughter of Crown Prince Akishino and Crown Princess Kiko, and her newly married husband Kei to New York to start their new life in the U.S. leaves its gate at Haneda airport in Tokyo, Japan November 14, 2021. REUTERS/Issei Kato 

Mako Komuro, former Japan's Princess Mako and the eldest daughter of Crown Prince Akishino and Crown Princess Kiko, and her newly married husband Kei board a flight bound for New York to start their new life in the U.S. at Haneda airport in Tokyo, Japan November 14, 2021. REUTERS/Issei Kato